todomvc-load-measurement.html

    <script>
        // Measure time from starting page load (enter in location bar)
        // until all the items are shown
        var i = setInterval(function() {
                var e = document.getElementById("itemsLeft");
                if (e) {
                        if (e.innerText == "1000 items left") {
                                done = window.performance.now(); // Relative to navigationStart (i.e. enter in loc
                                clearInterval(i);
                                window.alert("Initial load time: "+done+"ms");
                        }
                }
        },1);
   </script>